Continuously-loaded conductor



D'ec. 1924. 1,519,221

- E. SCHURER CONTINUOUSLY LOADED CONDUCTOR Original Filed Aug. 6, 1923 Elm 1251 Patented Dec. 16, 1924.

UNITED sures 1,519,221 PATENT OFFICE.

7 zoom: sonttm, or conoenn-uunnnm, GERMANY.

CONTINUOUSLY-LOADED CONDUCTOR.

Original application filed August 8, 18113, Serial 10.8,185. Divldedand this application filed October 81, 1aa4.- Serial No. 745,043.

To all whom. it may com-em:

Be it known that I, EuomtSorrt'mnn, a citizen of the German Republic, and reading at Genovevastrasse 94, Cologne-Mulheim, German have invented certain new and useful mprovements in and Relating to I Continuously-Loaded Conductors, of which the following is a specification. I

In specification'Serial No. 656,135 I have described a process for producing values of self-inductance per umt 0 length of the lengths of manufacture of continuously loaded conductors, by roducmg such unequal values of permea ility in each len h'by' the annealing of the continuously- 1 ed conductors that in spite of the diifeh ences in the weight of iron, all-the lengths of manufacture receive the same mean value of selfinductance per unit of length. The

value of the self-'inductancewhich changes durin the annealing, is measured, and the.

annea 'ng is efiected-by passing an electric current through the continuously loaded conductor so asito be able to measure and regulate it accordingly.

t has been found that certain iron alloys which are especially suitable as loading material, because of their high permeability, must be annealed to such a high temperature and for such a short period of time for obtaining its maximum permeability, that the electric annealing process is no longer suit-' able therefor. In view of the fact that in this case the heat is reduced in the copper from which the heatmgof the loading material is derived with comparatively substantial losses and moreover in view of the fact that the duration of annealing must be very short such a high temperature has-to be produced in thecopper conductor-above the required annealing temperature ofthe loading material that the latter reaches its melting limit and is destroyed. This ledto the problem of thinking out an annealing procsee in whichon the one hand the winding could be brought in a sufiicient short time to the required temperature without the conducting copper being afiected and in which,

equal simultaneous measurement ductance.

According to this annealing process,

tion of the conductor, and not thew ole length of it, is brought to the annealing temperature, a source of 'heat"being moved along the continuously loaded conductor at a speed corresponding to the realuired time of annealing and imparting heat ereto from the outside, that is to say over the winding, the said source ofheat being capable of bringing to the annealing temperature only a short portion of the conductor. It will thus be seen that in this way the annealing point, the temperature of which can be checked by means of a pyrometer, moves along the whole length of the conductor.

'ng the measurement of the self-inductance of the conductor that is effected simultaneously with the above annealing, a gradual increase inthe measured vaiue is observed during the progress of annealing. B y taking into consideratlon the minimum value of f-inductance per unit length that is attainable with the used loading." material the annealing when this .value has been at-- tained in each individual length of manufacture. At the utmost a short end piece of the length of manufacture remains un-annealed which accordingly-shows a smaller self-inductance per unit length-as compared with the annealed portion. 'However, .this inequality has-no 'damagin influence on the homogeneity of the con uctor constituted bythe individual lengths of manufacture because the length of conductor that shows this inequality is but. infinitesimally small as compared with the wave lengths of the electrical waves that are propagated along the conductor;- Whatis essential for the homoneity of the whole of. the conductor is that t e value of the self-inductance r unit of length of .the lengths of menu acture has the desired constant value,

As regards the measuring of the self-inductance during the annealing, the value of the self-inductance of the length of manufacture due to the windin has to be ascertained. This value is the ifi'erence'between the value that has been obtained from the measurement of the continuously loa'ded con- The measurement according to the in vcntion is effected as follows Prior to the annealing, the length of manufacture is wound on a drum i (Fig. I) in a well defined manner for instance in the form of regular spirals without the individual turns touching'each other and therefrom it is passed over the annealing point k in a. regular manner and wound on a second drum Z and the terminals provided on the two ends of the length of manufacture are connected to the .measuring device f, for instance a Wheatstone alternating currentbridge, through a sliding contact m provided at one end of each drum. If this measurement is carried out with a conductor-withoutwinding for each position of the two drums, a value is obtained which has to be deducted from the self-inductance value of the continuously loaded conductor corresponding tothe same position of the two drums in order to obtain the value of the self-inductance due solely to the winding.

The-following is a more-simple arrangement according to the invention. The continuously loaded conductor a (Fig. II) is wound in regular spirals on a drum of fireresisting material, being held away from its surface bydistance pieces provided at regular intervals, which distance pieces are. so small that they cannot well be indicated on the drawing. During the rotation of the drum by means of the handle a the source of heat which according to the invention preferably consists in this case of a blastllame 0, is moved along the longitudinal axis of the drum so that the annealing point moves. along the whole length of the conductor that is wound on the drum. The connection required for the measuring is againeffected through the intermediary of sliding contacts 2 provided at the ends of the drums. The measuring ofthe self-inductance is a very simple operation in this particular case since in this arrangement the formationof the conductor maintains its form during the whole annealing operation.

. What I claim is 1. A process for producing equal values of self-inductance per unit of length of each length of manufacture of a continuously loaded conductor, consisting in annealing conductor on a drum in well defined spirals which do not-touch each other, moving it therefrom in a-regular manner relatively to a. source of heat that is relatively moved to the conductor, conveying the annealing heat thereto from the outside and bring each time only .a comparatively short portion thereof to the annealing temperature, simultaneously measuring the self-inductance, stopping the annealing at the moment when the desired value of the self-inductance is attained and winding a second drum.

3.1K process for producing equal values of selfsindlutance per unit of length of each length of manufacture of a continuously loaded conductor, consisting in winding the conductor on a drum in regular spirals and annealing itvby' an external source of heat that isflmoved along the longitudinal axis of the drum Whilst the latter is rotated, in such a manner that the annealing point follows thewhole length of the conductor that is wound on the drum, simultaneously measuring the self-inductance and stopping the the conductor onto annealing at themoment when the desired 7 value of the self-inductance is attained.

4. A process for producing equal values of self-inductance per unit'of length of each length of manufacture of a continuously "loaded conductor, consisting in annealing the conductor by a blast-flame that is relatively moved tothe'conductor, the annealing heat being conveyed to the conductor from the outsde and bringing each time onlya comparatively'short portion thereof to the annealing temperature, simultaneously measuring the self-inductance, and stopping the annealilngat the moment when the'desired value ofthe self-inductance is attained.

In testimony whereof I-have signed my name to this specification.-

- EUGEN soHuRER. 

